EN 14654-2:2013

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.6DQDFLMDManagement und Überwachung von betrieblichen Maßnahmen in Abwasserleitungen und -kanälen - Teil 2: SanierungGestion et contrôle des opérations de nettoyage des canalisations d'évacuation et d'assainissement - Partie 2: RéhabilitationManagement and control of cleaning operations in drains and sewers - Part 2: Rehabilitation93.030Zunanji sistemi za odpadno vodoExternal sewage systemsICS:Ta slovenski standard je istoveten z:EN 14654-2:2013SIST EN 14654-2:2013en,fr,de01-december-2013SIST EN 14654-2:2013SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14654-2
January 2013 ICS 93.030 English Version
Management and control of operational activities in drain and sewer systems outside buildings - Part 2: Rehabilitation
Gestion et contrôle des opérations de nettoyage des canalisations d'évacuation et d'assainissement - Partie 2: Réhabilitation
Management und Überwachung von betrieblichen Maßnahmen in Abwasserleitungen und -kanälen - Teil 2: Sanierung This European Standard was approved by CEN on 17 November 2012.
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Rehabilitation approaches. 29A.1 Introduction . 29A.2 Rehabilitation planning objectives . 29A.2.1 Introduction . 29A.2.2 Technical objectives . 29A.2.3 Economic objectives . 30A.2.4 Legal objectives . 30A.3 Description of rehabilitation approaches . 30Bibliography . 32 SIST EN 14654-2:2013

This part covers the management and control of rehabilitation activities. It is applicable to drain and sewer systems, which operate essentially under gravity, from the point where wastewater leaves a building, roof drainage system, or paved area, to the point where it is discharged into a treatment works or receiving water. Drains and sewers below buildings are included provided that they do not form part of the drainage system of the building.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 752:2008, Drain and sewer systems outside buildings EN 13508-1:2012, Investigation and assessment of drain and sewer systems outside buildings — Part 1: General requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 extraneous water unwanted flow in a drain or sewer system
[SOURCE: EN 752:2008, definition 3.25] 3.2 inspection chamber chamber with a removable cover constructed on a drain or sewer that permits the introduction of cleaning and inspection equipment from surface level, but does not provide access for personnel
[SOURCE: EN 752:2008, definition 3.34] 3.3 maintenance routine work undertaken to ensure the continuing performance of drain and sewer systems [SOURCE: EN 752:2008, definition 3.40] 3.4 manhole chamber with a removable cover constructed on a drain or sewer to permit entry by personnel [SOURCE: EN 752:2008, definition 3.41] 3.5 pipeline length continuous section of drain or sewer between two adjacent nodes
[SOURCE: EN 13508-2:2003, definition 3.26] SIST EN 14654-2:2013

Table 1 — Scope of rehabilitation
Examples of system related measures Examples of component related measures Restore original Performance • Remove extraneous flows • … • Cleaning • Repair • Renovation • Replacement (like for like).
Upgrade original Performance • Maximise use of existing flow capacity • Reduce hydraulic input to the drain or sewer system • Attenuate peak flows • … • Replacement (increased capacity).
EN 752:2008, Clause 6, outlines the process for preparation and implementation of an integrated drain and sewer system management plan which includes, at a strategic level, a plan for rehabilitation of the drain and sewer system. The amount of detail in the rehabilitation plan in the integrated drain and sewer system plan can vary.
This European Standard sets out a process for implementing the rehabilitation proposals in the integrated drain and sewer system management plan. The process is based on a staged application of the process outlined in Figure 1. SIST EN 14654-2:2013

Figure 1 — The integrated sewer system management process (based on EN 752:2008, Figure 5) The integrated sewer system management process is applied successively to develop a rehabilitation programme based on the integrated sewer system management plan. The programme outlines a series of discrete rehabilitation projects to implement the rehabilitation proposals in the plan. Following this, the integrated sewer system management process is then used to produce a detailed specification for each of these projects in the programme. Finally, following the implementation of each project, the rehabilitation programme and the integrated sewer system management plan are reviewed and updated where necessary. The performance requirements for the rehabilitated systems should be in accordance with EN 752:2008, 5.2. At each stage further investigation and assessment is carried out in accordance with EN 13508-1.
This staged process is summarised in Figure 2. SIST EN 14654-2:2013

Figure 2 — Summary of the rehabilitation management and control process SIST EN 14654-2:2013

It is not necessary for the rehabilitation plan to include detailed descriptions of the solutions. It may include only general descriptions of the approaches to be taken.
A number of different approaches to rehabilitation options which may be used in preparing a rehabilitation plan are described in Annex A (normative). 6 Preparation of rehabilitation programme 6.1 Introduction The starting point for the preparation of the rehabilitation programme is the rehabilitation plan produced in accordance with EN 752:2008, Clause 6, and the performance requirements produced in accordance with EN 752:2008, Clause 5.
The rehabilitation plan does not generally contain the necessary detail to proceed directly to the production of the project specification. The rehabilitation programme defines a series of projects, in line with the rehabilitation plan, to ensure that the drain and sewer system meets the performance requirements. The rehabilitation programme should define the objectives for each project in sufficient detail so that a project specification can then be produced in accordance with Clause 7.
The preparation of the rehabilitation programme involves: a) review of the rehabilitation plan (see 6.2) to ensure it is still current and to establish what further investigation is required to develop the programme; b) further investigation (see 6.3) to provide the information necessary for the more detailed assessment; c) more detailed assessment (see 6.4) to identify further detail of the performance deficiencies that the programme needs to address; d) preparation of the programme (see 6.5) setting the scope and objectives for each of the projects. All stages of the preparation of the rehabilitation programme shall take account of the health and safety principles set out in EN 752:2008, Clause 7. 6.2 Review of the rehabilitation plan A review should be undertaken of the rehabilitation aspects of the integrated sewer system management plan.
If there have been any changes then the plan should be updated. 6.3 Investigation The investigation of the drain and sewer system shall be carried out in accordance with EN 752:2008, Clause 6, and EN 13508-1:2012, Clause 5.
The scope of the investigations necessary to produce the rehabilitation programme will depend on the extent of the investigations carried out during the preparation of the integrated sewer system management plan. Investigations shall be carried out where further information is required in order to produce the rehabilitation programme. Examples can include:  further inspection in parts of the system where the original assessment was based only on sample inspections;  the production of more detailed sewer flow simulation models, where the original assessment was based on a simplified model;  more detailed studies of the impact of any discharges on receiving waters.
The types of investigation can include:  investigations of the existing drain and sewer system (e.g. visual inspections, radar, sonar, flow measurements, sewer flow simulation modelling, wastewater quality simulation modelling);  more detailed investigations of the impact of proposed new developments in the area (e.g. hydraulic modelling etc.);
 other investigations to determine feasibility of options (e.g. preliminary topographical, geotechnical and other investigations (see EN 752:2008, 8.1, item 2 in list, and EN 752:2008, 9.3)). Details of investigation techniques for existing drains and sewers are described in EN 13508-1. 6.4 Assessment The performance of the drain or sewer systems shall be assessed in accordance with EN 13508-1:2012, Clause 6, using the results of the investigation (see 6.3). The assessments carried out during the preparation of the rehabilitation plan should be reviewed and updated in the light of any new information identified during the investigations. The performance at each planning horizon shall be compared to the performance requirements to identify the needs for rehabilitation. The assessment should identify the location of those components of the drains and sewer system where proactive or reactive rehabilitation are to be carried out. This shall be based on:  a knowledge of the characteristics and structural condition of the drain and sewer system;  an understanding of existing and past failures and their association with performance deficiencies including their impact on operations and maintenance of parts of the drain and sewer system concerned; SIST EN 14654-2:2013

The results of the assessment should be checked with the assessment made during the production of the integrated sewer system management plan and if there are significant differences the plan should be reviewed to ensure that it is still valid.
6.5 Develop the programme 6.5.1 Introduction The rehabilitation programme comprises a number of projects which together shall meet the rehabilitation objectives. The programme shall define the scope and objectives of each project in the programme. The programme should include the phasing of the projects including the relationship to any external constraints such as budgets, new developments, and interactions with other utility or development programmes (e.g. highway works). The programme shall take account of the safety principles in EN 752:2008, Clause 7. The programme should specify the classes of solutions (see Table 2) to be adopted. The process of developing the programme is summarised in Figure 3 below.
Figure 3 — The solution development process SIST EN 14654-2:2013

any current rehabilitation plan for the catchment. This should include issues relating to new development and solutions involving major upgrading work and maintenance, as well as changes to operational practices. Within this framework a number of feasible options should be developed.
Where appropriate the options should include solutions that address a number of problems. Examples include:
 replacement of a pipe to resolve a structural problem could also be used to resolve a hydraulic problem on a neighbouring area by diverting flow from a neighbouring area into the new pipe;
 reduction of flows could be used both to reduce flooding and to reduce discharges from combined sewer overflows.
The assessment of each performance deficiency identified in the rehabilitation plan should be reviewed taking account of the additional information collected in developing the programme (see 6.3 and 6.4). The options should specify the group and class of solution. Examples of solutions are given in Table 2 below.
Table 2 — Solution types, groups and classes for rehabilitation Type Group Class Hydraulic Maximise use of existing flow capacity. Removal of constrictions. Reducing hydraulic pipeline roughness (including head losses at structures, junctions, etc.). Cleansing. Source control – Reducing the hydraulic input to the drain or sewer system. Diversion of surface water flows to infiltration drainage systems or pervious areas. Use of porous pavements. Diversion of flows to another system. Manage surface water on the surface.
Reduction of infiltration and inflow of extraneous water.
Attenuate peak flows. Utilisation of existing storage potential within the system (strategically placed flow controls). Utilisation of surface storage (including storage within the property boundary). Provision of additional storage (tank sewer or detention tank).
Increase drain or sewer system flow capacity. Replacement with larger pipe. Construction of additional pipeline. Environmental
Reduce pollutant inputs to system. Sediment basins and grit separators.
Use of vegetation to absorb pollutants from runoff before entering the system. Controlling inputs (e.g. trade effluents).
Decrease planned pollutant discharges to receiving waters. Increase of flows to treatment (see hydraulic solutions above). SIST EN 14654-2:2013

Decrease impact by relocation of points of discharge.
Reduce exfiltration by rehabilitation measures. Repair techniques (e.g. sealing leaks). Renovation techniques (e.g. provision of watertight lining). Replacement of pipeline using open-cut or trench-less techniques.
Structural Protect fabric of drain or sewer by provision of appropriate linings or internal coatings.
Rehabilitate fabric of pipeline. Repair (see EN 15885). Renovation (see EN 15885). Replacement.
Operational Planned inspection and cleaning of a drain or sewer. The management and control of sewer cleaning activities should be carried out in accordance with EN 14654-1.
Increased frequency of maintenance of pumps or pumping stations.
This list is not exhaustive.
Examples of the decision processes for considering solutions are given in Figures 4 and 5. Figure 4 gives an example of the decision process for the solutions involving only structural rehabilitation of the fabric of pipelines and Figure 5 gives an example of the process for solutions involving hydraulic rehabilitation.
Figure 4 — Example of process for selection of technique class for structural rehabilitation of pipelines SIST EN 14654-2:2013

Figure 5 — Examples of process for selection of technique class for hydraulic solution types
For hydraulic solutions the study should establish effects and feasibility of, for example: a) the extent of and feasibility of works necessary to remove constrictions; b) the feasibility of reducing hydraulic inputs and the effect of those reductions; c) the feasibility and effects of mobilising storage in the system or in ponds or tanks;
d) the feasibility of diverting flows out of the system; e) the route and profile of new pipelines; f) the feasibility of increasing flow capacity by renovation of pipelines.
For environmental solutions the study should establish, for example: g) the feasibility of reducing pollutant inputs and the scope of works necessary; h) the feasibility of reducing discharges by increasing hydraulic capacity; i) the feasibility of improving performance of combined sewer overflows or relocating the discharge point; j) the class of solution necessary to reduce exfiltration.
For structural solutions the study should establish, for example: k) the group or class of solution necessary to restore the structural integrity of a pipeline. For operational solutions the study should establish, for example: l) the feasibility of increasing capacity by drain or sewer cleaning.
All options that meet the minimum performance requirements and that are technically feasible to implement should be taken forward to the next stage.
6.5.4 Select optimum solution The selection of the most appropriate option shall then take account of a wide range of costs and benefits of each of the options. These should take account of the extent (if any) to which any option would result in the drain or sewer system achieving more than the minimum performance requirements or providing additional capacity beyond that currently anticipated.
Criteria for assessing the costs and benefits of different options in order to select the optimum solution are given in EN 752:2008, 6.4.3.
6.5.5 Producing the programme The rehabilitation programme should contain the description of a number of defined projects that are within the framework of the integrated sewer system manage
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